All the more reason to go with a broker who doesn't make you jump through hoops just to get paid. K & N may be large, but there are over 20 thousand brokers out there, and a few of them are straightforward to deal with.
I'll take my brokerage for example. We bend for the carriers' sake... some are small mom and pops who write out invoices in longhand, and a few don't submit invoices at all. So long as they submit a POD and a remit to address, we'll take it from there. The hard reality is that many carriers, although smart and capable, aren't run by college grads. And many more don't have the time to visit and revisit, re revisit, and to re re re visit invoices because they don't look quite right to the broker.
We bend and flex because it is OUR days to pay on the line. Am I going to drag out a payment for six months because a carrier didn't dot all his I's and cross all his T's on the invoice ?.. that would be really stupid. My days to pay are my calling card... anything that gets in the way of increasing my days to pay is a BAD THING, even when that bad thing is self inflicted bullshit devised by idiots who should have been fired a long time ago!
And then of course, there's being easy to do business with. If the broker is an asshat with a lot of gibberish and "policies", he/she will drive away good carriers who simply want to move freight, get paid and move some more freight.